3.0 Sending unit
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Senior User
Joined: Jun 2003
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3.0 Sending unit
I have 2000 3.0 5speed ranger fuel guage reading not reading right sometimes it does sometimes reads full I want to change just the sending unit but can only find the whole assembly avg 275 to 300 does anyone know a place to get just the sending unit?
Cargo Master
Joined: May 2004
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The fuel sending unit is a variable resistor made up of a ceramic substrate. It is controlled by the action of a float arm. When the fuel level is low, resistance in the unit is low. (15 ohms) When the fuel level is high, the resistance is high. (160 ohms).
So, I think that over time the resistance increases due to natural attenuation, thus the guage reads too high, i.e, reads over full when full, reads 1/4 tank when empty.
I have this problem on my 1999 Ranger 3.0L V6, I haven't gotten around to fixing it yet. I plan on fixing it by adjusting the mechanical parts of the sender.
Definetly too pricey to buy a new sending unit/fuel pump. I don't know of any place that sells the sending unit alone.
So, I think that over time the resistance increases due to natural attenuation, thus the guage reads too high, i.e, reads over full when full, reads 1/4 tank when empty.
I have this problem on my 1999 Ranger 3.0L V6, I haven't gotten around to fixing it yet. I plan on fixing it by adjusting the mechanical parts of the sender.
Definetly too pricey to buy a new sending unit/fuel pump. I don't know of any place that sells the sending unit alone.
Moderator
Joined: Jan 2004
Posts: 13,851
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From: SW Va
Some areas have had problems with high sulphur fuel hitting the market & messing up fuel pumps & corroding sending unit contacts.
Chevron claims that their "Techron Concentrate Plus", will clean up & prevent further corrosion & wake up the sending unit, so maybe thats worth consideration.
If you decide to try it, I'd run the tank down to about 1/8 remaining, then add the Techron at the prescribed oz/gal dose rate at the pump, before filling up with Chevron, Texaco, or CalTex gas, as they already have some Techron in them, so the added treatment will be about 10X the pump gas level, so you might see results in one treatment.
If it doesn't wake the sender up, as a side benifit, it'll clean up the fuel system, injectors, intake valves & decarbon the combustion chamber!!!!
I've read that Shell & the folks they sold gas too were some of the sources of marketed high sulphur fuel, so if you suspect that you've used a high sulphur fuel, maybe corroded sender cotacts are your intermittent fuel level reading problem.
More thoughts for pondering.
Let us know what you find.
Chevron claims that their "Techron Concentrate Plus", will clean up & prevent further corrosion & wake up the sending unit, so maybe thats worth consideration.
If you decide to try it, I'd run the tank down to about 1/8 remaining, then add the Techron at the prescribed oz/gal dose rate at the pump, before filling up with Chevron, Texaco, or CalTex gas, as they already have some Techron in them, so the added treatment will be about 10X the pump gas level, so you might see results in one treatment.
If it doesn't wake the sender up, as a side benifit, it'll clean up the fuel system, injectors, intake valves & decarbon the combustion chamber!!!!
I've read that Shell & the folks they sold gas too were some of the sources of marketed high sulphur fuel, so if you suspect that you've used a high sulphur fuel, maybe corroded sender cotacts are your intermittent fuel level reading problem.
More thoughts for pondering.
Let us know what you find.
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Senior User
Joined: Jun 2003
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Ill try it... worth it to me. I was gonna do something like a lucas fuel system treatment to clean up fuel system its a new truck to me dont really know history of maintainence it has 147000 on it just got it about a month ago and been sorting it out. thanks
